Most people think Mesmers are the supreme trebuchet users due to their ability to instantly repair, but I disagree:
High burst classes are great for using the trebuchet because they can effectively defend the trebuchet. They can kill enemy players before they can even touch the trebuchet. Less time spent repairing = more up-time on trebuchet, so you can support your team with trebuchet shots more frequently.
It just so happens that Warriors are very 1v1-oriented, so the class fits quite perfectly with the role of trebuchet user.
Feel free to discuss, ask questions, comments, etc.
In tournament PvP, this is basically what I do all day on Battle of Kyhlo:
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